Awaiting delivery on an A7S and looking for a native zoom to pair with it for AF. Would like the sharpest all around. Fast lenses are welcomed but not a requirement since I'll be cranking up the ISO. So trying to decide between the kit 28-70, 24-70, and 24-240. I already have the kit lens for my A7 but it's nothing spectacular. I like the 24-70 for its constant aperture, but have heard that the wide end is too soft and the glass overall is just not worth the money. There aren't too much feedback on the 24-240. Anyone have any preferences over the other? As of right now, my expectations for these zooms aren't too high. But I'm sure there are users who have good things to say about either one of these.